Airbag control unit with part number CK4T-14B321-DJ

What does the airbag control unit CK4T-14B321-DJ do?

The airbag control unit CK4T-14B321-DJ is the central control unit of the restraint system (SRS) for Ford. It processes the signals from the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered. After an accident it stores crash data and locks itself.

The unit checks the system without interruption and displays faults via the airbag warning light.

The lock is lifted only by the repair.

Why does the control unit CK4T-14B321-DJ fail?

For the CK4T-14B321-DJ, the most common cause is crash data stored after an accident, even if no airbag has triggered. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A standard diagnostic tool cannot erase this crash data. They remain stored until they are removed during a repair.

Electronic components age over time, and moisture can attack plug connections. Cold solder joints are also a possible weak point.

Voltage spikes arise from a weak battery or from jump-starting. Only the inspection of the unit shows which cause is present.

How can you tell that the CK4T-14B321-DJ is defective?

The airbag warning light in the instrument cluster lights up at the CK4T-14B321-DJ permanently or intermittently. Added to this are an error message in the instrument cluster, a missing connection between the diagnostic tool and the control unit, or a fault memory that cannot be cleared.

If the warning light indicates something, airbags and seatbelt pretensioners may not trigger in an emergency. Have the restraint system checked promptly for this reason.

The indication is intended to alert you to a fault.

Which vehicles is the CK4T-14B321-DJ fitted in?

The airbag control unit CK4T-14B321-DJ is fitted in these vehicles: Ford Transit 7 ’14 (from 2014).

The vehicles at a glance:

• Ford Transit 7 ’14 (from 2014)

(a) Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. (b) Have the fault memory read out beforehand. Only this log shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers BK2T-14B321-BF, BK3T-14B321-AC, DT1T-14B321-DF, KT1T-14B321-KD, LK4Z-14B321-C, LK4Z-14B321-E.

How does the repair of the CK4T-14B321-DJ work?

For the CK4T-14B321-DJ, read out the fault memory and enclose the log. Then disconnect the battery and remove the control unit. Work at Airbag24 usually takes 3–4 working days.

Afterwards you create a repair order online and pack the unit well for sending.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The own unit then goes back to you. Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit CK4T-14B321-DJ get to Airbag24?

You send the control unit CK4T-14B321-DJ as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order in the parcel and pack the unit shock-proof.